My daughter has a brain tumor.

How can I put it? Oh, of course it's very dangerous. As long as there is a little mistake, there will be life-threatening and sequelae, but no one can tell. If you fail, you will lose the person you love the most, but good people will always be rewarded. I wish you all the best, and I believe you believe in her. Don't think too badly of things. You better make her feel better.